Friday, October 16, 2026
Capt. Mike's Question of the Day.
Two questions for the Transport Canada pilot written exams every day: a morning warm-up and an evening Captain's Challenge. Each one answered, explained and cited, free. Tap your answer to see how you did.
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Capt. Mike: Here's the question I asked that day. Tap your answer.
Unless oxygen and oxygen masks as specified in CARs are readily available, no person shall fly unpressurized aircraft above
Question 5.04 of TP 11919E, Department of Transport, Canada; reproduced with the Department's permission.
TC's answer
413,000 feet ASL.
Explanation
The table to CARs 605.31(1) requires oxygen in an unpressurized aircraft for "All persons on board the aircraft" for the entire period of flight above 13,000 ft ASL, and CARs 605.32(2) says that above 13,000 ft ASL "each person on board the aircraft shall wear an oxygen mask and use supplemental oxygen for the duration of the flight at those altitudes." Between 10,000 and 13,000 ft oxygen is needed only for flight lasting more than 30 minutes, so 13,000 ft is the altitude above which you cannot fly at all without it.
Memory tip: "10 for 30, 13 for all": above 10,000 ft for more than 30 minutes, crew need oxygen; above 13,000 ft, everyone needs it at all times.
Source
CARs 605.31(1) table (Oxygen Requirements for Unpressurized Aircraft); CARs 605.32 (use of oxygen).
Question 5.04 of TP 11919E, Study and Reference Guide: Student Pilot Permit or Private Pilot Licence for Foreign and Military Applicants, Aviation Regulations (7th ed., December 2022), Department of Transport, Canada; reproduced with the Department's permission. The keyed answer agrees with Transport Canada's published answer key (December 2022); the explanation is TC Exam Prep's.
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